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Dec. 14, 1926. 1,610,615

W. SCHAFF ER ARRANGEMENT FOR MAINTAINING ANODE VOLTAGE CONSTANT IN TUBE TRANSMITTERS Filed 001:. 28, 1924 INVENTOR" WALTER SCHAFFER TTORNEY Patented Dec. 141, M26.

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' wnmnnscnisrrnng or BERLIN, eemmmus lm To ensnnnscnanr Ftmnnanr- I LOSE TELEGRAPHIE M. s. Ii, or BERLEN, GERMANY, A oonrona'rron on GERMANY.

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Application filed October 28, 1924, Serial No. 746,287, and in GermanyNovember 17, 19 23.

It isknown that the voltage of alternating current generators, due to the reaction ofthe armature, in case of inductiveload, is lower than that voltage generated by thesame 1direct-current excitationin case of no load;

on the contrary, in the case of a capacitive load, the voltage is higher than the corresponding no load voltage. v

The present invention utilizes this phenomenon for maintaining the anode voltage of vacuum tube transmitters'constant in signalling. 1

An object of the invention is to provide such an arrangement which Wlll cause the generator to have a leading power factor f when a load isdrawn therefrom by the function of the tube transmitter and to have less leading-power factor or lagging power fac tor when no load is drawn therefrom.

Other objects will be apparent from the following description and appended claims when considered with the accompanying drawing in which the single figure 1s a circuit illustrating the invention. Referring to' the drawing,- transformer a, capacity 6, and variable iron inductance C011 0 are serially connected in the output clrcuit oi alternator Gr. The iron inductance 0 is constructed in" the known way, in that thefalternating cur-[1 rent windings d andjci are divided and are placed on two different iron cores 0, and 0 and the premagnetlzation windings, w and y surround both iron cores so that no alternating voltages are generated in them. Counoter-premagnetization due to winding 9 and batterys compensates the premagnetization by? the anode current passing thru winding w when the sender T is at rest. I

The sendingtube T has its anode current supplied from alternator G thru double rectifier g. The input and output circuits of tube T are arranged to be connected'to produce sustained oscillations by the" operation of sending key A."

I In case of 0 load a low primaryfcurrent' is present in the transformer a. "The transformer has a comparativelylhigh self-induc tance and, likewisethe, lI'OIl inductance 0, as I N radio waves having an 'element'to be vsup- (telegraphy interval)',the generator is inductively loaded. I j

and the generator G is capacitively loaded.

, Accordingly thegenerator is capacitively loaded whilstsignalling and, on the contrary, is inductively loaded atno load. Ac cording to the present method by means of the capacitive loading settingin, in case of load, the resulting excitation and, conse quently the voltage or tl1egenerator,-(by suitably dimensioning the capacity Z) and inductance 0) 1s increased insuch a way that the voltage in case of loadis equal to that in case of noload. 7 v 1 Having disclosed. my invention, I am entitled to all modifications thereof as fairly fall within the scope of thefollowing claims.

1. In combination,means for transmitting radiowaves having an element to be supp-lied with current at constant potential. means forsupplying the current having an inher ent drooping voltage characteristic on in- .ductive load, inductive and capacitive load ing means, means for varying one'of said last means to offset the other sufliciently ac-- cording to the current suppliedtothe transmitting meansto keep the voltage applied to said element constant within the range of operation of the transmitting means;

2. In combination, means fortransmitt-ing radio waves having anelement to be supplied with current at constant potential,

"one type of reactive load, inductive and capacitive, loading means, means for varying one of said last meansto otfse'tthe other suf- 'ficiently according to the current supplied to the transmitting means to keep the voltage applied to'said element'const'ant within the range of' operation of the transmitting means.

3. In combination, means for transmitting plied with current at constant potential,

vmeans for supplying the current having an inherent droopingvoltage characteristic on one of said last means to offset the other sufficiently according to the current supplied to the transmitting means to keep the voltage applied to said element within the useful range of operation of the trans initting means.

4:. In combination an oscillator, a modulator controlling the output of the oscillator, a rectifier for supplying the oscillator with current, a generator for supplying the rectifier and having capacitive and inductive loading devices, one of said devices being controlled by the rectifier current to keep the balance of inductive and capacitive load at the right proportion to produce constant generator output potential.

5- In combination an oscillator, a modulator controlling the output of the oscillator, a rectifier for supplying the oscillator with current, a generator for supplying the rectiiier and having capacitive and inductive loading devices, the inductive device being controlled by the rectifier current to keep the balance of inductive and capacitive load at the right proportion to produce constant generator output potential.

6. In combination an oscillator, a modulator controlling the output of the oscillator,

a rectifier for supplying the oscillator with current, a generator for supplying the rectitier and having apa citive and inductive loading devices, the inductive device having windings traversed by the rectifier current.

7. In combination an oscillator, a modulator controlling the output of the oscillator, a rectifier for supplying the oscillator With current, a generator for supplying the rectifier and having capacitive and inductive loading devices the inductive device having windings traversed by the rectifier current, and an auxiliary current, supplied to offset the eti'ect oi the rectifier current.

8. in combination an oscillator, a modulator controlling the output of the'oscillator, a rectifier for supplying the oscillator with current, a generator for supplying the rectif'ier having capacitive and inductive loading devices, the inductive device having windin s traversed by the rectifier current, and an auxiliary current, supplied to offset the eilect of the rectifier current, when the minimum current flows through the rectifier.

9. in combination an oscillator, a modulator controlling the output of the oscillator, 21. rectifier for supplying the oscillator with current, a generator for supplying the recti fier and having ca )acitive and inductive loading devices, the inductive device having windings traversed by the rectifier current,

and an auxiliary current, supplied to offset the cii'ect oi the rectifier current, when the iiinum current flows through the rectier, whereby constant potential is maintainon the oscillator.

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